CHARACTERISATION OF LOCATION DISCREPANCIES BETWEEN ENVISAT/ERS SHIP DETECTION REPORTS AND AIS RECORDS DURING THE MARISS PHASE 2 TRIALS IN FRANCE

摘要

During the first phase of the MARISS [1] project CLSrnhas set-up a near real time vessel monitoring chainrnbased on its operational system for surveillance ofrnillegal fishing in the Indian Ocean and integrating thernSARTool? software, developed by BOOSTrnTechnologies.rnTrials performed in the English Channel in 2006 werernpresented in ENVISAT Symposium 2007 showingrnseveral coupling examples between ENVISAT IS6 datarnand VMS systems, a comparison by the user to VTMSrndata, and also raising several perspectives ofrnimprovement [2]. This paper focuses on the secondrnphase of the project.rnAs for the first phase, ENVISAT SAR scenes (narrowrnswath, IS6 submode, HH polarization) were acquired,rnprocessed at Level 1b (ASA_IMP products) andrnprovided by Kongsberg Satellite Services (KSAT), andrncompleted by ERS PRI images acquired by ESArnstations through Cat-1 mechanism, ENVISAT WS shiprndetection reports through ESA GSE MARCOAST, andrnmetocean data acquired by CLS.rnAutomatic Identification System (AIS) data were usedrnin addition to VMS and VTMS for ground truthrnidentification of vessels.rnThis paper presents the main results of these trials:rn1. An assessment of new chain capabilitiesrnimplemented after the first phase, such as thernazimuth ambiguity removal function in thernnew version of SARTool?rn2. The use of GIS to reduce false alarms andrnassess image geolocation.rn3. The potential interest of combining ERS andrnENVISAT datarn4. A characterization of differences betweenrnlocations reported by satellite radar andrnautomatic identification systems.